Steam-superheater.



J. G. ROBINSON. STEAM SUPEBHEATER. APPLICATION FILED OCT. 23. 1916.

L8UL66 Patented Apr. 22, 1919.

IIIVEIITOR. JOHN cEpRGE Roam-son.

J. G. ROBINSON. STEAM SUPERHEATEH. APPL lCATIbN FILED ucr. 23. 1916.

Patented Apr. 22,1919.

2 SHEETS-SHEET 2- mmmw IIIVEHTOR. JOHN GEO RGE ROBINSON.

JOHN GEORGE ROBINSON, 0F MANCHESTER, ENGLAND, ASSIGNOR TO SUPERI-IEATERCORPORATION, LIMITED,

OF LONDON, ENGLAND.

STEAM-SUPEBHEATER.

Specification of Letters Patent.

Patented Apr. 22, 1919.

Application filed October 23, 1916. Serial No. 127,280.

To all whom it may concern Be it known that I, JOHN Gnonen Romn- SON, asubject of the King of Great Britain and Ireland, residing atManchester, England, (whose post-office address is Mere Bank, Fairfield,Manchester, Lancashlre, England,) have invented certain new and usefulImprovements in and Relating to Steam-Superheatens of the Multiple Smokeor Fire Tube Type; and I do hereby declare the following to be a full,clear,- and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention has for its object improvements in and relating to steamsuperheaters of the multiple smoke or fire tube type.

The invention relates more particularly to those types of superheatersin which the saturated steam inlet and superheated steam outlet ends orend portions of each super heater element are bent laterally orvertically and are fixed in holes in a plate or flange block these holesextending through the flange block at right angles or sub stantially atright angles to the axes of the smoke or fire tubes of the boiler intowhich the superheater elements extend and the flange block being securedto the bottom or to a wall of the header lying parallel or substantiallyparallel with the axes of the smoke or fire tubes.

The principal object of the present invention is to provide a moreefficient jointing of the ends of the superheater pipes or elements tothe bottom or wall of the header while at the same time providing forthe easy disconnection and withdrawal of the ends of the elements fromthe bottom or wall of the header and the easy withdrawal of the elementsfrom the smoke tubes of the boiler. Further the construction providesfreer access to the fastening nuts by which the flange blocks aresecured to the wall of the header. Other objects and advantages attainedby the several illustrated constructions according to this inventionwill be hereinafter set forth.

In the drawings, Figure 1 is a side view of a portion of a superheaterconstructed according to this invention. Fig. 2 is a vertical section ofone of the devices for securing the end portions of the superheaterelements to the header, and is drawn to a larger scale. Fig. 3 is a sideview and a plan view of the fastening block shown in Fig. 2. Fig. is aplan view of a fastening block showing a modification. Fig. 5 is asectional plan view of portions of the header and one of the boilerfire-tubes, showing the fastening block of Fig. a preferred form ofsuperheater element. Figs. 6 and 7 are plan views of fastening blocksshowing modifications.

The boiler is provided with a tube-plate 1 and fire-tubes 2, and 4 is aheader secured in the smoke-box in front of the ends of the fire-tubes.This header is divided by suitable partitions 13 into chambers forsuperheated steam and for saturated steam. An inlet 14. is provided inthe header for the saturated steam, and an outlet 15 for the superheatedsteam. All of these parts are of any approved construction.

The superheater elements 3 are U-shaped pipes which extendlongitudinally in the fire-tubes. In order to connect these pipes 3 withthe header, they have end portions 5 and 5 arranged at substantially aright angle to their main portion, and the sides of the header haveholes 9 and 9 for the steam. The end portions of the pipes 3 are rigidlysecured in fastening blocks 6, by expanding them in holes therein bymeans of a tube-expander, or they are secured therein in any otherapproved manner. The fastening blocks 6 are secured to the header bystuds 8 which are permanently screwed into holes in the header sidewall. The projecting portions of the studs extend through holes 7 in thefastening blocks, and have fastening nuts screwed on them.

The studs are preferably arranged at the end portions of the block withthe steam ipes between them, and the joint between the block and theheader is made steam-tight in any approved way.

The fastening blocks are arranged verti cally in separate sets as shownin Fig. 1, and the studs of each set are arranged in parallel horizontalplanes. In order to facilitate the removal of the superheater elementsfrom the fire-tubes, each fastening block 6 has a relatively deep slotor channel 10 formed crosswise in the side of it which bears against theheader wall and at the end of each stud hole 7. When a superheaterelement is to be removed, its fastening nuts 11 are removed,

L and showing also and the fastening block is slid upon its studs untilthe free ends of the studs are clear of its holes 7, and are in itsslots 10. The slots 10 are proportioned in depth so that the pipes 3 donot jamagainst the side wall of the fire-tube before the studs are clearof the holes 7, and the superheater element is removed by sliding itlongitudinally when the slots 10 are free to slide laterally over thestuds.

In the fastening block shown in Fig. 2 and Fig. 3 the pipes and studsare all arranged in one plane. In the modification shown in Fig. 4c thepipes and studs are arranged in staggered relation.

In Fig. 5 the pipes 2 have offset parts 12 in their main portionsadjacent to their end portions 5 and 5*, and which are offset so thatthey project toward the header. These offset parts are preferablyprovided as they will afford more space and will also spring a little,and will permit the disengagement of the blocks 6 from the studs withmore clearance before the pipes jam in the fir tubes. This constructionalso permits the fastening blocks to be made of liberal thickness, whichis desirable.

he superheater element nearest the tube plate of the boiler is removedand replaced by sliding its block 6 over all the studs of it pertains,and the slots. 10 are therefore formed to extend clear across thefastening blocks.

In the modification shown in Fig. 6 the studs 8 are arranged in a planemidway between the steam pipes; and in the modification shown in Fig.one fastening block is shown connected to two superheater elements,instead of to one element as shown in Fig. 7.

What I claim is:

In a superheater, a header provided with holes for steam in its sidewall, superheater elements having their end portions arranged at anangle to their main portions, screwthreaded studs which project from theside wall of the header, fastening blocks secured to the end portions ofthe superheater elements and provided with holes for engaging with thesaid studs, said blocks having also slots or channels formed crosswisein them at the ends of their stud holes andslidable laterally over thestuds, and nuts on the studs for securing the blocks to the header. In asuperheater, a header provided with holes for steam in its side wall,superheater elements having theirend portions arranged at an angle totheir main portions and having oflset parts in their main portionsadjacent to their said endportions and projecting toward the header,screwtlireaded studs which project from the side wall of the header,fastening blocks securedto the end portions of the su erheater elementsand provided with holes f said studs, said blocks having also slots orchannels formed crosswise in them at the ends of their stud holes andslidable laterally over the studs, and nuts on the studs for securingthe blocks to the header.

In testimony whereof I have affixed my signature in resence of twowitnesses.

JOI lN GEORGE ROBINSON. itnesses:

W. H. SINsoN, WESTALL H. BARKER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

or engaging with the

